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A Verizon official told The Journal that the breaches appear similar to the Target attack, which compromised more than 40 million credit and debit card numbers.
"I'd say the earmarks of these situations look very, very similar," Bryan Sartin, the director of the research, investigations, solutions, knowledge team at Verizon's enterprise solutions unit, told the Journal. "At this point and I'd be surprised if they were different."